Olea europaea (Olive) is an ornamenal evergreen tree or shrub. It can grows up to 20' in height. In indoors, planted in a pot, you can keep it much smaller. It thrives best in full sun. Growing olive trees need as much direct sunlight as possible year-round. Turn your plant every week in front of the window to ensure even growth. Moving your plant to a sun-drenched porch or patio for the summer will give it a boost. Water your plant regularly during the growing season and always keep the soil evenly moist but never allow your plant to sit in water. You can allow the topsoil to become slightly dry between each watering. During the winter months, reduce watering.